Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Two Australians injured in London attack

Two Australians have been confirmed injured in a stabbing attack that left a US woman dead in central London.

The Australians, a man and a woman, suffered non-life-threatening injuries in Wednesday night's attack in Russell Square, a Department of Foreign Affairs and Trade (DFAT) spokesperson said in a statement on Thursday.

Armed police were called at 10.33pm local time after a Norwegian man of Somali origin with a knife started to attack people in the square.

Police said there was no evidence the attack was terrorism related and evidence to date pointed to it being triggered by mental health issues.

An American citizen in her 60s was treated at the scene but pronounced dead a short time later.

Another woman and four men were treated in hospital, though three of them were later discharged. Nationals from Britain, Israel and the US were also among those hurt.

The DFAT spokesperson said the injured Australian man had been discharged from hospital and the injured Australian woman was expected to be discharged soon.